I would like to import a Sketchup component from the 3D Warehouse (a modeled piece of furniture) into ArchiCAD 13 but don't know how. I am reading various answers - do I need the Sketchup Add-On for ArchiCAD, or a Goodie? I don't really know much about Sketchup. By exporting the item as a .dwg I was able to bring it into ArchiCAD as a line drawing but I'd love to have the whole model.

I would use the Google Earth Connections add-on as it requires fewer steps and does not require the pro version of Sketchup (free version does not export to 3ds file).

The GEC add-on allows you to directly import models from the Google 3D warehouse. It also allows you to open .skp files directly in ArchiCAD. Once the add-on is installed, when you go to File>Open you will notice that .skp has been added to the available filetypes to open. The add-on also allows you to import and export from/to Google Earth, etc.